This article on Solving the Offline Logout Problem applies to both platforms, where you need to deal with a logout when the user is not connected to the internet. Sounds easy, but there are some considerations.

iOS

After 11 years of a predictable cycle, Apple is Changing It’s iOS Development Strategy, focussing on key features, and pushing others back for following years. This will certainly take the pressure off their developers and will lead to better quality releases.